Codebook with nested structure
US8346193B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 12, 2012 |
| Grant date | Jan 1, 2013 |
| Priority date | — |
| Expiry date | Jul 12, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B7/0639
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A multi-rank beamforming (MRBF) scheme in which the downlink channel is estimated and an optimal precoding matrix to be used by the MRBF transmitter is determined accordingly. The optimal precoding matrix is selected from a codebook of matrices having a recursive structure which allows for efficient computation of the optimal precoding matrix and corresponding Signal to Interference and Noise Ratio (SINR). The codebook also enjoys a small storage footprint. Due to the computational efficiency and modest memory requirements, the optimal precoding determination can be made at user equipment (UE) and communicated to a transmitting base station over a limited uplink channel for implementation over the downlink channel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.